3. The genetic code is commaless, which means that no codon is reserved for punctuations. It means that after one amino acid is coded, the second amino acid will be automatically, coded by the next three letters and that no letters are wasted as the punctuation marks (Fig.
Summer solstice is the first day of summer - it's usually between June 20th and June 23rd. In 2016, the summer solstice takes place on June 20th. We know it's summer because the earth's axis tilts toward the sun from June to September - this means warmer weather and longer days.
1 During the summer solstice, the North Pole has a 24-hour day and the South Pole has a 24-hour night. 2  During the summer solstice, sunlight strikes the earth most directly at 23.5 degrees North (the Tropic of Cancer). The earth makes one revolution every 24 hours. 2  The earth averages 150 kilometers (93 million miles) from the sun. 3  The earth is closest to the sun in January and most distant in June. 4  The earth tilts 23.5 degrees off vertical. 5  The Northern Hemisphere tilts toward the sun in summer and away from the sun in winter.